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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92e734b933a32ce24284616644015df6c068db2e9e35ade2999a26939dd9f1c' 
  AND token = 'YAJEi1oEhsNSXGnCVCbMWLJA2J/87CeuTJn2BdsaMXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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