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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f6d1bd7a9df03e8f32c76fa63834388e2a4d3107b0f0bd08c26b22368ea170' 
  AND token = 'hzPt0jE9zXpauew/9eNioxO96ffmy5ilH+gKX91z1Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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