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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f263f8eefa0560920b0e1c99235f3cd0096abdf78b8d4864dcf7361fd6b10fa6' 
  AND token = 'VTSkRDjz4OMZp1L9DBCv0+kkMt6OwjH+78R33+QwXwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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