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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb7afb5344aa84e7716184a9a3fcf8e3acaad505f6ab4509de79bcd0fce2cf8' 
  AND token = 'H3zzybjlaF2eocxk4KRCsRNeOBJxDO+lL4SZwdCCYAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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