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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50b085cf0b6d4cf41bd018e7f0cb4e68258a0b3701c08f2c18aea1ab765dfec9' 
  AND token = '65qB+keq0WSn9GRv/fzb7ssxrQlFV5jmWFzGowqmPFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}